We pick f.root-servers.net, one of the 13 root servers (1), and ask it about melbourneit.com and learn that com is delegated to 13 name servers (2), so we ask h.gtld-servers.net where we learn that melbourneit.com is delegated to two name servers, including ns2.melbourneit.com.au (3), so we ask that one and get the following answer: